76 THE GYPSY MOTH APPENDIX. 



each bears on the upper surface a large, blunt, horn-like 

 protuberance, which is terminated with a bristle. Numer- 

 ous other hairs occur on these caudal appendages. The 

 ventral portion of the body is yellowish white except the 

 parts which are strengthened by chitinous plates. 



Spiracles seal brown, nine on each side, borne in shallow 

 depressions just below the lateral edges of the dorsal plate, 

 ion the meso-thorax and on each abdominal segment except 

 the last. Those on the abdominal segments are small and 

 circular, while the thoracic spiracles are decidedly larger 

 and elliptical in outline. Legs (Fig. 7) small, very muscu- 

 lar and spiny. Coxfe very stout, dark brown ; trochanters, 

 femora and tibia' slender, reddish brown; tarsi of same 

 color, one jointed and bearing two simple claws. The anal 

 proleg is slender, tapering and bears a number of short 

 -pint's. This appendage serves the double function of act- 

 ing as an organ of locomotion and also containing the cav- 

 ity into which the rectum discharges. General color of 

 under surface sordid white, varying to light gray, variously 

 marked with light seal-brown patches. Head and anterior 

 part of prothorax seal brown. Two lateral rows of elon- 

 gated markings of similar color extend along the body 

 beneath the spiracles. The upper row terminates on the 

 penultimate segment, the lower row on the last segment. 



The markings forming the upper row are single and 

 entire on the first two thoracic segments ; on the meta- 

 thorax there are two spots, the anterior being the smaller. 

 On the abdominal segments the ruarkino-s are somewhat 



O C 



circular, two to each segment, a large orbicular marking 

 being followed posteriorly by a smaller one of similar shape. 

 The markings composing the lower row are in general 

 elliptical, and occur singly on the segments stated. On 

 both the rneso- and meta-thorax there is a single small brown 

 spot on the median line. In a corresponding position on 

 each of the following segments except the last two, and 

 near the anterior margin, there is a large elliptical, trans- 

 verse, seal-brown spot. Posterior to this marking on each 

 of the segments mentioned there is a transverse row of four 



C 



small spots of similar color. On the last two segments the 

 .median spot is quite large and somewhat pentagonal in out- 



